#!/usr/bin/env python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np

N = int(readline())
A = np.array(readline().split(), np.int64)
Q = int(readline())
m = map(int, read().split())
TV = zip(m, m)
Acum = np.cumsum(A)
A24 = Acum[23:]
A24[1:] -= Acum[:-24]
best = A24.max()

for t, v in TV:
    dx = v - A[t - 1]
    A[t - 1] = v
    L = max(t - 24, 0)
    A24[L:t] += dx
    y = A24[L:t].max()
    if best < y:
        best = y
    print(best)